支架现浇的异型系杆拱桥合理施工状态的确定.pdfVIP

第25卷 第3期 公 路 交 通 科 技 V01．25 No．3 2008年3月 Journal of Highway and Transportation Research and Development Mar．2008 文章编号：1002-0268(2008】03-0093-06 支架现浇的异型系杆拱桥合理施工状态的确定 李传习 ，曾革助 ，刘 扬 (1．长沙理工大学 桥梁与结构工程学院，湖南 长沙 410076； 2．中交第四航务工程勘察设计院有限公司，广东 广州 510230) 摘要：以支架现浇施工的长沙市黄柏浏阳河异型拱桥为工程背景，对异型拱桥施工全过程进行受力分析，给出了异型 拱桥施工过程中各典型状态的受力性能和合理施工工序。异型系杆拱桥裸拱状态拱圈弯矩呈s形分布，拱圈支架分区 卸落和成桥状态索力调整引起的弯矩增量分布可以用相应连续梁的弯矩来比拟。钢筋混凝土异型拱桥施工中不得出现 裸拱状态；拱圈支架需按一定次序分区卸落，卸落过程中需按一定要求调整吊杆索力。 关键词：桥梁工程；异型系杆拱桥；合理施工状态；受力性能；拱架卸落；调索 中图分类号：U448．22 5 文献标识码：A Determination of Reasonable Construction States of Special_’shaped 11ecI—arch Bridge Casting in Place with Full Framing U Chuan-xi ，ZENG Ge-zhu2，LIU Yang (1．School of Bridge＆Structure En nee魄 ，Changslla University of Science and Technology，Chinch． Hunan 410076，China； 2．The Fourth I-I~3Dor Engineering Survey and Design Institute，Gllan~ou Guangdong 510230，China) Abstract：The Huangbo~uyang River Bridge casting in place with full framing，which is a special—shap~ tied— arch bridge，Was taken as the object to study the structural behaviors for typical construction states and reasonable construction procedures．In the present study，the reasonable sequences of arch deeentering，the sequences and amount offorce adjustment of inclined cable tensile forces of each state were determined．Moment distribution of arch ring of special-shaped tied-arch bridge is at the shape of“S”，and the distribution of moment increment caused by zonal decentering of arch ring scaffold and hanger force adjustment at the completion state can be assimilated to distribution ofmoment of continuous bridge．Reinforced concrete special-shaped tied-areh bridge